Electric circulation fluid heater



Aug. 11, 1925. 1,549,016 c. D. MGLEAN ELECTRC CIRCULATION FLUID HEATER Filed July '7, 1923 INVENTOR 6720s. Mclean.

6 A i W//w//Mf /2 ATTORNEY Patented Aug. .11, 1925.

UNITED sTarEs.

a RATENT OFFICE.

CHARLES D. MCLEAN, OF BERLIN, NEW HAMPSHIRE, ASSIGNOR TO MECHANICAL &

ELECTRICAL MANUFACTURING CO.,

INC., OF BERLIN, NEW HAMPSHIRE.

ELECTRIC CIRCULATION FLUID HEATER.

Application filed July 7,

To all 'whom it may concern.'

Be it known that I, CHARLES D. MGLEAN, a citizen of the United States, residing at Berlin, in the county of Coos and State of New Hampshire, have invented a new and Improved Electric Circulation Fluid Heater, of which the following is a specification..

The invention relates to certain new and useful improvements in fluid heaters of the type stated and is more particularly directed to improvements in that type of fluid heater which is disclosed Iin Patent #1,460,025 issued under date of June 26 1923 upon application Serial No. 561,941, filed May 18, 1922.

The invention primarily has for its object to provide a liuid heater of the type stated which is of a. simple and economical construction, one that can be readily7 installed, in an inexpensive manner, in the pipe line through which the Huid to be heated passes, and which is adapted to func-tion so as to practically instantaneously heat the fluid as it passes therethrough.

More. particularly the invention seeks to provide a water heater of the type stated which is of such construction that the same may be readily spliced into the house service water supply pipe in a reversible manner, that is, either end first, and so that the water drawn from the said service pipe may be heated, while being drawn, when desired.

`With the above objects in view my invention also includes those novel features of construction, combination and arrangement of parts, all of which will be first fully described, then be specifically pointed out in the appended claims and illustrated in the accompanying drawing, in which:

`Figure 1 is a part longitudinal section and elevation of my improved fluid heating appliance.

Figure 2 is an end view thereof showing the end cap as removed.

Figure 3 is a detail cross section taken through one of the hollow communicating heads.

In the drawing, in which like numerals of reference indicate like parts in all of the gures, 1 represents an outer casing for the 1923. Serial No. 650,033.

fluid heating devices and the same is preferaibly constructed of fibrous or other like material such as will tend to render the same moisture proof, electrically non-conducting, strong and durable.

The outer casing 1 is provided with apertures 2, the purpose for which will later appear, and when the. parts are operatively assembled is adapted to have the open ends thereof closed by end caps 3, preferably of wood, which are held to their proper relation with the casing 1 by suitable screws 4. One of the end caps 3 is provided with an aperture 5 for accommodating a porcelain plug 6, the purpose of which will presently appear.

Suitably mounted within the casing 1 I provide a plurality, two being shown, of heating units 7 which may be of any approved construction but which are preferably constructed in the manner disclosed in my Patent #1,460,025, issued under date of June 26, 1923 upon application Serial No. 561,940, liled May 19, 1922.

Each such heating unit 7 is surrounded by an inner casing 8, the opposite threaded ends of which thread into accommodating taps in hollow communicating heads 9 and the said heating units extend through the hollow portion of the heads 9, through suitable glands 10 provided therefor and secured in the said heads, and extend beyond the said glands where provision is made at 11 for properly connecting the heat-ing units with an electric circuit so that, when the circuit is energized, the electric energy will cause the heating units to function in applying heat to the Huid passing through the appliance in a manner soon to be described.

In accomplishing the above stated purpose, the wires 12 of the elect-ric circuit pass through the porcelain block 6 of one of the caps 3 and connect as at 11 to o-ne end of the pair of heating units illustrated in Figure 1. From this figure, it will be observed that the other ends of the heating units there shown are connected by a cross plate 13 to properly complete the circuit so that electrical energy will pass through one of the wires 12 through the heating agencies in that Il (l `is, it is innnalerial wh particular unit 7 through the cross plate 13 and bach through the opposite heating unit 7 and the wire l2 connected thereto to prop orly complete the circuit.

Each of the hollow comniunicating heads 9 is provided with a lateral internally threaded extension into which is threaded a fluid pipe lil adapted to extend through the apertures 2 in the casing l in a manner for being readily connected with the source ol supp y ot -tluid to be heated, in a. reversible manner.

By reference to Figures l and 3, it will be observed that the inner casings 8, which surround the heating unit 7, are et such size as to provide a lluid passage l5 between the same, and the said heating unit is ot' such length and so mounted that the said fluid passages thus provided are in common communication with the hollow ot the heads 9 at the opposite ends thereof. Each heating unit i is provided with a spirally wound member 1G which extends through the lluid passage l5 and into the hollow ot each head 9 in a manner iter causing the fluid which passes through the passage l5, hereinbetore referred to, Vto take a spiral course, thereby retarding its passage tlirough my improved heating appliance so that the same will be more thoroughly brought into contact with the heating units, to be more thorouggghly heated thereby.

For properly insulating the heatingl units contained within the outer casing l against the cold outside air and also to provide ilor retaining the heat radiated ilrom the said units, the casing l is filled with cori; or other like substance l?. This compact liller of coi-li, or other similar material, also protects the units contained within the casing l against injury ty contacting shot-hs and jars incident during the application oli my appliance within the house service pipe or other practical connection,

@3y reason of thus providing a con'imunieating head at each end ot a plurality ot heating unit carrying inner casings, the hollow thcreol' is in common with all ot the water passages iituined between the said heating units and the inner casings, and

by providing the pipe colnmunications lll between the said heads nd the outside o'l' the casing l, it will be readily apparent that a reversible strucuf'f" is presented, that oli' the pipes 'lel be connected as the inlet or outlet pipe, as either will 'function universally.

Bj. reason ol providing the spiral pieces or me: hers 16 in the spares or Fluid passages 15, the llow of circulation olf the fluid reuulated in a manner whereby tl edesired Quirk heatirm; olA the same is clleoted.

.lt will be also readily understood that by providing the glands in the communieating heads for the heating units to pass through, any possible expansion and contraction otl the said units is taken care ot and they are rendered pressure tight.

From the foregoing description, taken in connection with the accompanying drafviug, it is thought the complete construction, operation and advantages olf my invent-ion will be readily understood by those skilled in the art to which it appertains.

lllhat l claim is:

l. ln a heating appliance ot the class described an, outer lasing, a plurality of heating units within said casing, means for con necting the heating units with an electric circuit, inner casings surrounding the heating units in a manner to provide a lluid pa;-isage thereoet-weei'i, con'imunicating heads tor communicating with all ol the luid passages, and means whereby the communiating heads are in conimunication with the exterior et the outer casing and whereby attachment may be made with the source el? supply et the lluid to be heated.

2. ln a heating appliance ol the class described, a plurality ot heating units, means whereby said heating` units may be connected with an electric circuit, casings tor surrounding said heating units in a manner to provide lluid passages therebetween, a hollow con'imunicating head in communication with all olf the tluid passages at each end through which the heating units pass, and means whereby the said communicating heads may be reversibly connefiaed with the source oi,l supply olf Huid to be heated.

Pi. ln a heating appliance oil' the class dcscribed, a plurality oitl hea ting unitsT a casing surrounding cach heating unit in a manner to provide a (luid passage therebetween, a hollow coinmunicating head in communication with all olf the 'l'luid passages at each cud, ballles in said lluid passages and ei;- tending into the hollow ot said communieating heads, glands in each communicating head through which the heating units pass to extend beyond the heads, means whereby the extended ends oit the heating units may be connected with an electric circuit, and means whereby the said coinn'umicating heads may be reversibly connected with the source ot supply ot l'luid to be heated.

ln a heating appliance oit the class described, an outer t: sing, a plurality ot' heat ing units within said casing, an inner casing surrounding each heating unit in a manner to prei/'ide a fluid imssage therebetween, a hollow coiumiinicatingjg head to which the ends olE the inner casings are connected at each end thcreoil an d in a manner whereby the hollow ot each such head will be common to all et kid fluid passages, ballles in said vlluid ofi es :und e endii'ig into the communi lating head, glands hollow ot caca in each said head throiigh which the heating units pass to extend, beyond the said (iii lill) heads, means at one end thereol1 Wheeby the extended ends of the heating units may be connected with the Wires of an electric circuit, ineens at the other extended ends of the heating units for connectingl the same electrically for completing the electric cilcuit, a fluid pipe connected With each com inunicating heed outer casing for and projected hifough the convenient` reversible connection with the source of supply ol: fluid l0 lo be heated, and ineens in said onci' casing 'whereby the heating units are insnlziccd from cold nii', moisture and shock.

CHARLES D. MGLEAN, 

